<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            margin-top: 10px;

        }
        .box1{
            width: 100px;
            height: 100px;
            background-color: red;
            /*visibility: hidden;*/
        }
        .box2{
            width: 100px;
            height: 100px;
            background-color: blue;
        }
        .box1:hover{
            /*display: none;*/
            visibility: hidden;
        }
    </style>
</head>
<body>
    <!--
        display:none消失  display:block
        visibility:hidden隐藏
    -->
    <div class="box1"></div>
    <div class="box2"></div>
</body>
</html>